7th Accelerated Math - Area & Circumference of Circles Review

​ (a)   is the ratio of ​ (b)   to ​ (c)  

• Pi
• circumference
• diameter

The relationship between circumference and diameter will always be ​ (a)   . When graphing this relationship, the constant of proportionality will always be approximately ​ (b)  

• proportional
• 3.14
• not proportional
• 1
• 2

Select all ratios that could represent the ratio of circumference to diameter of a circle

Ms. Shillibeer's back table has a circumference of 360 inches. What is the radius, rounded to the nearest inch, of the back table (use 3.14 for pi)?

Sunshine Preschool has a teeter totter that spins in a circle. The distance from the outside edge to the other outside edge is 74 inches. What is the area rounded to the nearest tenth? Use 3.14 as pi.

• 264

• 5544

• 132

• 1764

• 9
• square feet
• feet
• 3
• 36

• 1386

• 5544

• 21

• 84

A plate with a radius of 4.6 inches is on a table. To get a placemat that fits, it must extend 3 inches beyond the edge of the plate in all directions. What is the approximate area of the placemat? Use 3.14 for pi.